public AmplitudeDecorator(IValueNoise2d valueNoise, float amplitude = 1.0f)
 {
     this.valueNoise = valueNoise;
     this.amplitude  = amplitude;
 }
 public FrequencyDecorator(IValueNoise2d valueNoise, float frequency = 1.0f)
 {
     this.valueNoise = valueNoise;
     this.frequency  = frequency;
 }